When you shake the device or press the button it will make a whip sound. There is a setting to change the shake sensitivity and audio volume. The full version also has a home screen widget that makes the whip sound, and it has multiple themes. Full Version Link https://play.google.com/store/apps/details?id=com.grantojanen.whipped More Details Offline: Yes Lightweight: less than 1MB Multi-Window Support: Yes Descriptor: whip sound joke/prank